Universal Tin on Carbon Specimen on 15mm Hitachi

This tin on carbon test specimen has a very wide size range of tin spheres which give high contrast when imaged in the SEM. The largest spheres can be used for basic column alignment at low magnification; intermediate sized spheres are useful for monitoring image shift when changing operating parameters or resolution checking at low kV; and the smallest spheres can be used for resolution checking and astigmatism correction at the very highest magnifications.